In an ill-conceived attempt to create a more durable harpsichord wax Professor Farnsworth put several dark matter (then useless) pieces in a particle accelerator, but because of quantum physics (as Deepak Chopra taught us that anything can happen for no reason), the dark matter was transformed into a single non-local meta-practicle in the form of a crystal that links all dark matter in the universe together, making it usable as fuel. With one drawback, if it ever came close enough to the anti-backwards crystal, it would render all dark matter useless again. Mom had stolen the Metaparticle, but thought the anti-backwards crystal was destoyed. When the fuel prices went skyrocketing, the Planet Expresscrew set out to take the anti-backwards crystal close enough to the metaparticle. After an adventure in an alternate reality, the crystals met and all Dark Matter was made useless again.